What absorbs at 2986 cm⁻¹ in an FTIR spectrum?
A band near 2986 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 5 cited sources
Quick answer
A band near 2986 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Possíveis atribuições de grupos funcionais
| Grupo funcional | Fatos de suporte | Fontes citadas | Maior confiança |
|---|---|---|---|
| Alkyl C-H | 5 | 5 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
A classificação reflete a evidência acumulada da literatura, não uma única regra autoritária. Sempre confirme com o contexto da sua amostra.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 2986 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literatura por trás destas atribuições
-
Alkyl C-H confiança 1,0
“cm-1 2986 peak is due to the n(C-H) groups.”
Bakan 等 - 2019 - Synthesis, characterization, toxicity and in vivo DOI: 10.1007/s10965-019-1901-7 -
N h confiança 1,0
“groups at 2986 The -NH peak (1586-1611 cm-1) is observed in the L-glutamic acid 2”
Bakan 等 - 2020 - Synthesis, characterization and toxicity assessmen DOI: 10.1002/bip.21333 -
Alkyl C-H confiança 1,0
“cm-1, The FT-IR spectrum of pure AMPS revealed peaks at 2986 representing the C-H cm-1 cm-1 stretching of -CH 2, while two bands at around 1666 and 1612 were due to cm-1 C=O stretching and C=C stretching, respectively [33].”
Synthesis and Characterization of Carboxymethyl Chitosan Nanosponges with Cyclodextrin Blends for Drug Solubility Improvement DOI: 10.3390/gels8010055 -
Hydroxyl (O-H) confiança 1,0
“The positive sign for the cm-1 cm-1 3277.06 (O-H stretching) and 2985.81, 2941.44 coefficient of a (polymer) indicated that the entrapment (C-H stretching).”
Sakhare 等 - 2021 - Studies on Formulation and Evaluation of Eudragit DOI: 10.5530/ijper.55.1s.40 -
Alkyl C-H confiança 1,0
“The spectral peak at 2985.66 revealed C-H stretching of-CH 2.”
Development of β-cyclodextrin/polyvinypyrrolidone-co-poly (2-acrylamide-2-methylpropane sulphonic acid) hybrid nanogels as nano-drug delivery carriers to enhance the solubility of Rosuvastatin: An in vitro and in vivo evaluation DOI: 10.1371/journal.pone.0263026
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